Nodejs
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Node.js is a JavaScript runtime built on Chrome's V8 engine that uses an event-driven, non-blocking I/O model. It includes a package ecosystem called npm that is the largest open source library ecosystem. Node.js executes JavaScript using Google's V8 engine written in C++, which compiles JavaScript to machine code using two compilers. Node.js is commonly used for real-time applications due to its asynchronous nature and uses an event loop model.
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Nodejs
- 2. Click to edit Master text styles What is Node.Js ? Node.js is a JavaScript runtime, built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.
- 3. Click to edit Master text styles The Creator “Ryan Dahl is an American freelance programmer living in Germany. His work invariably involves interruptible parsers, event loops, and response time histograms. He is the creator of several open source projects including the Ebb web server and the "EY" load balancer module for Nginx.”
- 4. Click to edit Master text styles Install NodeJS on your machine Go to https://nodejs.org. Starting a node project
- 5. Click to edit Master text styles Syntax Convections The error-first pattern was used into Node • The first argument of the callback is reserved for an error object • The second argument of the callback is reserved for any successful response data. DEFINING AN ERROR-FIRST CALLBACK
- 6. Click to edit Master text styles How do NodeJS Works ? • NodeJS Console : Node.js comes with virtual environment called REPL (aka Node shell). REPL stands for Read-Eval-Print-Loop. • V8 Engine runs on the machine
- 7. Click to edit Master text styles How do NodeJS Works ? • Architecture :
- 8. Click to edit Master text styles How do NodeJS Works ? Example
- 9. Click to edit Master text styles How do NodeJS Works ? Example
- 10. Click to edit Master text styles Require Module
- 11. Click to edit Master text styles Chrome's V8 JavaScript engine It handles memory allocation and garbage collection. Read more: http://thibaultlaurens.github.io/javascript/2013/04/29/how-the-v8-engine-works/ Google’s V8 engine, written in C++, compiles and executes JavaScript source code. Its design consists of two compilers that compile source code directly into machine code. –Full Codegen, -CrankShift A JavaScript engine is a program or library which executes JavaScript code.
- 12. Click to edit Master text styles Do we have other JavaScript engines ? Browser, Headless Browser, or Runtime JavaScript Engine Mozilla Spidermonkey Chrome V8 Safari JavaScriptCore / Nitro IE and Edge Chakra PhantomJS JavaScriptCore HTMLUnit Rhino TrifleJS V8 Node.js V8 Io.js V8
- 13. Click to edit Master text styles What are its alternatives ? • github.com/reactor/reactor (jvm) • vertx.io (jvm) • coolio.github.io (ruby) • github.com/blesh/ALE (.net) • reactphp.org (php) • cyclone.io (python)
- 14. Click to edit Master text styles Why is it becoming popular? • High-Performance • Easy to modify and maintain • Productivity • Reduce the number of servers needed to serve customers • Data Intensive Real Apps
- 15. Click to edit Master text styles Application Areas for Node.js • The Internet of Things • E-Commerce • Payment Processing • Social Media • Realtime Services • Media • Enterprise Web Service
- 16. Click to edit Master text styles Who all are using NodeJs
- 17. Click to edit Master text styles What is NPM ? It is also a command-line utility for interacting with repository that aids in package installation, version management, and dependency management It is an online repository for the publishing of open- source Node.js projects Short for Node Package Manager Basically it is the package manager for node. It helps with installing various packages and resolving their various dependencies
- 18. Click to edit Master text styles What is NPM ? https://www.npmjs.com/
- 19. Click to edit Master text styles What are some well known Frameworks? • Node.js Express. ... • Sail.js (node.js mvc) ... • KOA. ... • Meteor - Full Stack Node.js Framework. ... • Derby.js. ... • Flatiron.js (Node.js MVC Framework) ... • Hapi - Node.js Web Application Framework. ... • Mean.IO - Node.js Application Framework.
- 20. Click to edit Master text styles Express JS • inspired by the Ruby project 'Sinatra‘ • most popular • Allows to set up middlewares to respond to HTTP Requests. • Defines a routing table which is used to perform different actions based on HTTP Method and URL. • Allows to dynamically render HTML Pages based on passing arguments to templates • Easy to learn
- 21. Learn more at nodejs.org Thank you